$(function(){
         
          var banner = ["https://img11.hostingpics.net/pics/373218yumeno2.png","https://img11.hostingpics.net/pics/373218yumeno2.png"];
         
          $("#pun-logo,#i_logo,#logo img").attr("src",banner[Math.floor(Math.random()*banner.length)]);
         
        });